Question

Which of the following best completes the statement: moles are useful for determining...?

(A) the number of atoms in a 10 g sample of an element
(B) the volume of a 10 g sample of an element
(C) the density of a 10 g sample of an element
(D) the isotopes of a 10 g sample of an element
(E) the mass of 10 atoms of an element

Answer 1

Moles are useful for determining the number of atoms in a 10 g sample of an element by using the molar mass and Avogadro's number.

Step-by-step explanation:

The correct answer to the question 'Which of the following best completes the statement: moles are useful for determining...?' is (A) the number of atoms in a 10 g sample of an element. Moles provide a specific measure of the number of atoms or molecules in a bulk sample of matter because one mole contains Avogadro's number, which is 6.022×1023 discrete entities. Using the concept of molar mass, one can convert the mass of an element to moles and thereby calculate the number of atoms within that sample.